Chart holder



1. o. TRAUTWEIN. HAHT HOLDER. APPLICATION FILED MAR'. I7. 1920.

"1,41 6, 141 Patented May 16, 1922.

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UNITED STATES i JACOB O. TRAUTWEIN, OF CHICAGO, ILLINOIS. v

CHART HOLDER.

Specification of Letters Patent. I Patnted May 16, 1922.

` Application sied March 17,1920. seriai No. 366,692.

To all whom t may concern:

Be it known that I, JACOB C. TRAUTWEIN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a y.certain new and useful Improvement in Chart Holders, ofwhich the followingiis a specification.

My invention relates to chart holders and has for its object to renderit practical to place .a plurality of curvesor graphs upon a singlechart coextensively as to abscissee and based uponeither similar ordissimilar scales, the scale readings being arranged as ordinatesthatis, vertically. For the sake of illustration let it be assumed that amanufacturer fof bricks desires to keepa daily record of the variousoperations in his yard. For example, the number of green brick made, thenumber ofbrick set in the kiln, the number of brick completed y (burningfinished) the number of brick shipped, etc. He may of course plot curvesor graphs showing allof these operations on different ruled sheets orcharts,`but to do so is incone venient and expensive for the reason thatmany'sheets of` papers would have to be provided and handled. It alsohas the disadvantage of furnishing no ready means for comparing oneoperation with another on any given day or date. Furthermore, differentoperations are` frequently measured according to dierent scales.For,example, therecords of bricks set'may be kept in thousands while therecords of bricks shippedjmay be kept in carloads and if coal receiptsare kept they may be in pounds or in tons. My invention contemplates notonly the placing of a plurality of curves -upon thesame sheet andco-extensively as to abscissae, (or horizontal measurement) but also the`provision of 'means whereby `different scales may be readily broughtinto juxtapositionwith the chartsheet, whereby the different curves maybe readily interpreted. Another object is to provide a constructionrendering the device convenient to handle and also capable of storingcharts not temporarily in use or paper from which fresh charts may bemade.

I accomplish myv objects and purposes by the mechanism illustrated inthe accompanying drawings in which- Figure lis an assembly view of thedevice viewed from the front, certain portions being broken away toreveal the internal struc- Figure 2 is a plan section on'the line 2-'2Figure 1, and f i i f Figure 3 is a development of ya portion of thesurface of the scale drum .illustrating different scales which may beemployed. In other words, Figure 3 may be regarded as a fragment of thesheet of paper which is pasted upon the scale drum to exhibit thevarious scales used in conjunction with the curves upon the'chartproper.

Like numerals denote like parts throughout the several views.`

In the form selected to illustrate the invention, the device includes avcentral `plate or board 1, rectangular in outline and consistingpreferably of light weight sheet4 metal., flanged at its four marginaledges, to impart stiffness. Cylindrical tubes., 3, 4 are fastened at theends of the plate.` The tube 8 (located at theleft, Figure 1) contains adrum of a diameter slightly smaller than the internal diameter of thetube, and havingatits lower end a trunnion 8 j ournaled in the cap 9which forms a closure for the lower end of the tube. At` the upper endof the tube is a collar 10` into which screws a plug 12 which iscentrally bored to form a bearing for a shaft 11 which is rigidlyfastened to the drum for rotating it. The shaft and drum arey rotated bymeans of a small hand wheel 14 which is preferably knurled so that itmay be conveniently grasped between the thumb and i the `upper end has acollar 17 adapted to be closed by a screw plug 18. Thetubes 3 and 4 bothperform dual functions, one

of which is toV formvconvenient handles orl hand holds by which the usermay hold the board up in front ofv him when plotting or reading thecharts. A second function of the tube 4f is to furnish storage capacityfor a roll 2O of suitably ruled paper from which fresh charts may bemade. Likewise, it may be used for storingcharts representing'pastoperations.

A second function of the tube 3 at the left is to contain the drum v6,previously mentioned, which drum has lone or more sight aperturesv (inthe present case two) which are designated by 21 and 22 and c revealrestricted portions of the scale sheets 24,25 pasted or otherwisesecured to the sur- `spaced equidistantly and .in question.

face of the drum. In Figure 3 I have illustrated a portion of one oi thescaln sheets, this particular sheet having live different scales a, o,c, (Z, c. These scales maybe graduated in different Ways and may1ndicate various classes of items, but for the sake oi? illustration Ihave shoivn scale a entitled as No. 1 and graduated to show the numberof cars ot clay delivered: scale Z) entitled as No. 2 and graduated toshow the number of machine made brick in thousands: scale c entitled asNo. 3 and graduu ated to show the number of brick set in thousands:scale Z entitled as No. 4 and graduated to show the number ci bricks inthousands, unloaded from the kilns: scalo e entitled as No. 5 andgraduated to show the number of bricks shipped in thousands.

The chart proper, indicated by 26, consists of a suitably7 ruled sheeton which the curves or graphs may be plotted. lllhile the sheet may beheld in various Ways Without departing from the spirit ot the invention,in the present case the ends or the center plate are spaced slightlyfrom the tubes 3, 4 and the ends of the sheet are tucked into thesespaces and thus held. rlhe sheet is positioned vertically by gages 2Twhich in the present form consist or lugs struck out of the metal ofWhich the center plate is composed. The particularly ruled sheet chosenfor illustration has a number oit equally spaced upright lines numberedfrom l to 3l to represent the dii'ierent days oit the month. The mainhorizontal lines are the spaces between them are marked by sub-lines forindicating aliquot parts of the main lines. Different values may beascribed to the horizontal lines fon diierent curves, the valuesselected being in accordance with the values of the individual scale bywhich the particular curve is to be interpreted. As will be noted, thetube 3 has two sight apertures one above the other, and the chart sieethas tivo sets oi cross lines to correspond..

In practice, the individual curves or graphs are plotted in accordancewith Well known principles. In a case such as the one illustrated, toshow the operations on a brick yard, the days operation will be recordedeach day on the vertical line or ordinate allotted to that particularday ot the month. The height of the curve on that day or the value ofthe ordinate will be in direct proportion to What is accomplished on theday It is desirable to provide at the left edge of the chart sheet asuitably designated space 30 in which the scale numbers or` key numbersof the different curves may be marked. By observing the scale number inspace 30 .the operator is enabled to determine Y ivhatvscale to rotateto readin0V position withs in ,the sight aperture 2a or 25. It heWishes,

.in reading ,the chart, to determine the number of machine made brick,Ytor example, he rotates drum 6 to bring scale No. 2 at the readingposition adjacent to space 30 shoivn in Figure l. lire then directs hisattention to the particular curve YWhich commences at the key number 2in space SO, after which he proceeds to interpret the curve in themanner Well known to those accustomed to use graphical charts.

llVhile not at all essential7 it is nevertheless possible to employdiitercnt colored inks lor the diilerent curves thus making it a verysimple matter to follow any particular curve even though it may crossand recross the other curves. The fact is, however, that even though thecurves occupy the same general positions upon the sheet and mayfrequently cross each other, it is found in practice to be a simple andeasy matter to 'follow the selected curves from one edge oit the sheetto the other.

From the foregoing it will be evident that my device provides anextremely simple and compact means iter keeping and interpreting recordswhich may relate to a variety et diillerent subjects indicated upon avariety of different scales. Charts have been made in which a pluralityof curves occupy the same general area upon the sheet, but in such casesthe scales themselves with one eX- cept-ion, must necessarily beseparated by one or more intervening scales from the curves which theyare to interpret. This gives rise to confusion and uncertainty. Thisdrawback is avoided by the use of my device, for any required scale maybe instant-ly brought directly to the edge oi" the sheet Without anyintervening scales. This feature is of great importance for it not onlysaves time and care on the part oit the user but gives him a feeling oitcertainty that lends great value to the device. It Will be observed thatthe scale sheets are for the most part protected against Wear or damageby being enclosed Within a protecting tubular casing.

The device is not conlined to any one class of business for di'erentscale sheets may be readily applied to the drum. The drum may be removedat any time by simply un screwing the plug l2 and lifting it out, and itmay be replaced by the reverse operation. The chart sheets themselvesneed not be changed in form because different values may be ascribed tothe horizontal and vertical lines to correspond with the differentscales in conjunction with which they are to be read.

Having thus described my invention what I claim as neiv and desire tosecure by Let ters Patent, is

l. In a computing device, the combination of a chart having a pluralityof independent curves, with a plurality of scales, adjustable at willinto cooperative relation with said chart, each of said scalesoooperwith said'chart, each of said curves having ating With said chartin a predetermined difdiferent values when brought into eooperferentfactorial relation. able relation with said scales. 10

2. In a computing device, the eornbina-` In Witness whereof, I havehereunto 5 tion of a chart having a plurality of indesubscribed my name.

pendent curves, with a plurality of scales, adjustable at Will intocooperative relation JACOB O. TRAUTWEIN.

